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/*
* Copyright 2022 Anton Tananaev (anton@traccar.org)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.traccar.database;
import io.netty.util.Timeout;
import io.netty.util.Timer;
import io.netty.util.TimerTask;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.traccar.model.Device;
import org.traccar.storage.Storage;
import org.traccar.storage.StorageException;
import org.traccar.storage.query.Columns;
import org.traccar.storage.query.Condition;
import org.traccar.storage.query.Request;
import javax.inject.Inject;
import javax.inject.Singleton;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.TimeUnit;
@Singleton
public class DeviceLookupService {
private static final Logger LOGGER = LoggerFactory.getLogger(DeviceLookupService.class);
private static final long INFO_TIMEOUT_MS = TimeUnit.MINUTES.toMillis(60);
private static final long THROTTLE_MIN_MS = TimeUnit.MINUTES.toMillis(1);
private static final long THROTTLE_MAX_MS = TimeUnit.MINUTES.toMillis(30);
private final Storage storage;
private final Timer timer;
private static class IdentifierInfo {
private long lastQuery;
private long delay;
private Timeout timeout;
}
private final class IdentifierTask implements TimerTask {
private final String uniqueId;
private IdentifierTask(String uniqueId) {
this.uniqueId = uniqueId;
}
@Override
public void run(Timeout timeout) {
LOGGER.debug("Device lookup expired {}", uniqueId);
synchronized (DeviceLookupService.this) {
identifierMap.remove(uniqueId);
}
}
}
private final Map<String, IdentifierInfo> identifierMap = new ConcurrentHashMap<>();
@Inject
public DeviceLookupService(Storage storage, Timer timer) {
this.storage = storage;
this.timer = timer;
}
private synchronized boolean isThrottled(String uniqueId) {
IdentifierInfo info = identifierMap.get(uniqueId);
return info != null && System.currentTimeMillis() < info.lastQuery + info.delay;
}
private synchronized void lookupSucceeded(String uniqueId) {
IdentifierInfo info = identifierMap.remove(uniqueId);
if (info != null) {
info.timeout.cancel();
}
}
private synchronized void lookupFailed(String uniqueId) {
IdentifierInfo info = identifierMap.get(uniqueId);
if (info != null) {
info.timeout.cancel();
info.delay = Math.min(info.delay * 2, THROTTLE_MAX_MS);
} else {
info = new IdentifierInfo();
identifierMap.put(uniqueId, info);
info.delay = THROTTLE_MIN_MS;
}
info.lastQuery = System.currentTimeMillis();
info.timeout = timer.newTimeout(new IdentifierTask(uniqueId), INFO_TIMEOUT_MS, TimeUnit.MILLISECONDS);
LOGGER.debug("Device lookup {} throttled for {} ms", uniqueId, info.delay);
}
public Device lookup(String[] uniqueIds) {
Device device = null;
try {
for (String uniqueId : uniqueIds) {
if (!isThrottled(uniqueId)) {
device = storage.getObject(Device.class, new Request(
new Columns.All(), new Condition.Equals("uniqueId", uniqueId)));
if (device != null) {
lookupSucceeded(uniqueId);
break;
} else {
lookupFailed(uniqueId);
}
} else {
LOGGER.debug("Device lookup throttled {}", uniqueId);
}
}
} catch (StorageException e) {
LOGGER.warn("Find device error", e);
}
return device;
}
}
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